#include <iostream>
#include "head.h"

int main()
{
    int x = 80;
    int y = 40;
    std::cout <<x<<"+"<<y<<"="<<add(x,y)<<std::endl;
    std::cout <<x<<"-"<<y<<"="<<subtract(x,y)<<std::endl;
    std::cout <<x<<"*"<<y<<"="<<multiply(x,y)<<std::endl;
    std::cout <<x<<"/"<<y<<"="<<divide(x,y)<<std::endl;
    return 0;
}